Animation of Selected Object Not Show Showing in Editors
I don't see any problem with your file but I'm not playing it with the latest version.

For the moment the armature is playing the animation that you've pushed down into the NLA editor. To see or edit this action you can select the strip and press Tab, the strip will turn green and the keyframes will be displayed in the Dope Sheet.



If you want to load any other action, switch the Dope Sheet to its Action Editor mode and choose whatever action you want in the dropdown menu (now the Dope Sheet will play over the NLA, to come back to the NLA actions you'll need to close the actions you've opened in the Dope Sheet).



To switch directly from Dope Sheet to the Graph Editor you can press CtrlTab.

Also, the Only Include options may be useful sometimes to only see the keyframes of the selected bone(s) but don't forget to disable it if necessary: